1 /*
2  * V4L2 sub-device
3  *
4  * Copyright (C) 2010 Nokia Corporation
5  *
6  * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7  *	    Sakari Ailus <sakari.ailus@iki.fi>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22 
23 #include <linux/ioctl.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
26 #include <linux/videodev2.h>
27 #include <linux/export.h>
28 
29 #include <media/v4l2-ctrls.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-fh.h>
33 #include <media/v4l2-event.h>
34 
35 static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
36 {
37 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
38 	fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL);
39 	if (fh->pad == NULL)
40 		return -ENOMEM;
41 #endif
42 	return 0;
43 }
44 
45 static void subdev_fh_free(struct v4l2_subdev_fh *fh)
46 {
47 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
48 	kfree(fh->pad);
49 	fh->pad = NULL;
50 #endif
51 }
52 
53 static int subdev_open(struct file *file)
54 {
55 	struct video_device *vdev = video_devdata(file);
56 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
57 	struct v4l2_subdev_fh *subdev_fh;
58 #if defined(CONFIG_MEDIA_CONTROLLER)
59 	struct media_entity *entity = NULL;
60 #endif
61 	int ret;
62 
63 	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
64 	if (subdev_fh == NULL)
65 		return -ENOMEM;
66 
67 	ret = subdev_fh_init(subdev_fh, sd);
68 	if (ret) {
69 		kfree(subdev_fh);
70 		return ret;
71 	}
72 
73 	v4l2_fh_init(&subdev_fh->vfh, vdev);
74 	v4l2_fh_add(&subdev_fh->vfh);
75 	file->private_data = &subdev_fh->vfh;
76 #if defined(CONFIG_MEDIA_CONTROLLER)
77 	if (sd->v4l2_dev->mdev) {
78 		entity = media_entity_get(&sd->entity);
79 		if (!entity) {
80 			ret = -EBUSY;
81 			goto err;
82 		}
83 	}
84 #endif
85 
86 	if (sd->internal_ops && sd->internal_ops->open) {
87 		ret = sd->internal_ops->open(sd, subdev_fh);
88 		if (ret < 0)
89 			goto err;
90 	}
91 
92 	return 0;
93 
94 err:
95 #if defined(CONFIG_MEDIA_CONTROLLER)
96 	if (entity)
97 		media_entity_put(entity);
98 #endif
99 	v4l2_fh_del(&subdev_fh->vfh);
100 	v4l2_fh_exit(&subdev_fh->vfh);
101 	subdev_fh_free(subdev_fh);
102 	kfree(subdev_fh);
103 
104 	return ret;
105 }
106 
107 static int subdev_close(struct file *file)
108 {
109 	struct video_device *vdev = video_devdata(file);
110 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
111 	struct v4l2_fh *vfh = file->private_data;
112 	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
113 
114 	if (sd->internal_ops && sd->internal_ops->close)
115 		sd->internal_ops->close(sd, subdev_fh);
116 #if defined(CONFIG_MEDIA_CONTROLLER)
117 	if (sd->v4l2_dev->mdev)
118 		media_entity_put(&sd->entity);
119 #endif
120 	v4l2_fh_del(vfh);
121 	v4l2_fh_exit(vfh);
122 	subdev_fh_free(subdev_fh);
123 	kfree(subdev_fh);
124 	file->private_data = NULL;
125 
126 	return 0;
127 }
128 
129 static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
130 {
131 	struct video_device *vdev = video_devdata(file);
132 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
133 	struct v4l2_fh *vfh = file->private_data;
134 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
135 	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
136 #endif
137 
138 	switch (cmd) {
139 	case VIDIOC_QUERYCTRL:
140 		return v4l2_queryctrl(vfh->ctrl_handler, arg);
141 
142 	case VIDIOC_QUERYMENU:
143 		return v4l2_querymenu(vfh->ctrl_handler, arg);
144 
145 	case VIDIOC_G_CTRL:
146 		return v4l2_g_ctrl(vfh->ctrl_handler, arg);
147 
148 	case VIDIOC_S_CTRL:
149 		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
150 
151 	case VIDIOC_G_EXT_CTRLS:
152 		return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
153 
154 	case VIDIOC_S_EXT_CTRLS:
155 		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
156 
157 	case VIDIOC_TRY_EXT_CTRLS:
158 		return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
159 
160 	case VIDIOC_DQEVENT:
161 		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
162 			return -ENOIOCTLCMD;
163 
164 		return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
165 
166 	case VIDIOC_SUBSCRIBE_EVENT:
167 		return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
168 
169 	case VIDIOC_UNSUBSCRIBE_EVENT:
170 		return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
171 
172 #ifdef CONFIG_VIDEO_ADV_DEBUG
173 	case VIDIOC_DBG_G_REGISTER:
174 	{
175 		struct v4l2_dbg_register *p = arg;
176 
177 		if (!capable(CAP_SYS_ADMIN))
178 			return -EPERM;
179 		return v4l2_subdev_call(sd, core, g_register, p);
180 	}
181 	case VIDIOC_DBG_S_REGISTER:
182 	{
183 		struct v4l2_dbg_register *p = arg;
184 
185 		if (!capable(CAP_SYS_ADMIN))
186 			return -EPERM;
187 		return v4l2_subdev_call(sd, core, s_register, p);
188 	}
189 #endif
190 
191 	case VIDIOC_LOG_STATUS: {
192 		int ret;
193 
194 		pr_info("%s: =================  START STATUS  =================\n",
195 			sd->name);
196 		ret = v4l2_subdev_call(sd, core, log_status);
197 		pr_info("%s: ==================  END STATUS  ==================\n",
198 			sd->name);
199 		return ret;
200 	}
201 
202 #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
203 	case VIDIOC_SUBDEV_G_FMT: {
204 		struct v4l2_subdev_format *format = arg;
205 
206 		if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
207 		    format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
208 			return -EINVAL;
209 
210 		if (format->pad >= sd->entity.num_pads)
211 			return -EINVAL;
212 
213 		return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
214 	}
215 
216 	case VIDIOC_SUBDEV_S_FMT: {
217 		struct v4l2_subdev_format *format = arg;
218 
219 		if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
220 		    format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
221 			return -EINVAL;
222 
223 		if (format->pad >= sd->entity.num_pads)
224 			return -EINVAL;
225 
226 		return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
227 	}
228 
229 	case VIDIOC_SUBDEV_G_CROP: {
230 		struct v4l2_subdev_crop *crop = arg;
231 		struct v4l2_subdev_selection sel;
232 		int rval;
233 
234 		if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
235 		    crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
236 			return -EINVAL;
237 
238 		if (crop->pad >= sd->entity.num_pads)
239 			return -EINVAL;
240 
241 		rval = v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
242 		if (rval != -ENOIOCTLCMD)
243 			return rval;
244 
245 		memset(&sel, 0, sizeof(sel));
246 		sel.which = crop->which;
247 		sel.pad = crop->pad;
248 		sel.target = V4L2_SEL_TGT_CROP;
249 
250 		rval = v4l2_subdev_call(
251 			sd, pad, get_selection, subdev_fh, &sel);
252 
253 		crop->rect = sel.r;
254 
255 		return rval;
256 	}
257 
258 	case VIDIOC_SUBDEV_S_CROP: {
259 		struct v4l2_subdev_crop *crop = arg;
260 		struct v4l2_subdev_selection sel;
261 		int rval;
262 
263 		if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
264 		    crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
265 			return -EINVAL;
266 
267 		if (crop->pad >= sd->entity.num_pads)
268 			return -EINVAL;
269 
270 		rval = v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
271 		if (rval != -ENOIOCTLCMD)
272 			return rval;
273 
274 		memset(&sel, 0, sizeof(sel));
275 		sel.which = crop->which;
276 		sel.pad = crop->pad;
277 		sel.target = V4L2_SEL_TGT_CROP;
278 		sel.r = crop->rect;
279 
280 		rval = v4l2_subdev_call(
281 			sd, pad, set_selection, subdev_fh, &sel);
282 
283 		crop->rect = sel.r;
284 
285 		return rval;
286 	}
287 
288 	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
289 		struct v4l2_subdev_mbus_code_enum *code = arg;
290 
291 		if (code->pad >= sd->entity.num_pads)
292 			return -EINVAL;
293 
294 		return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
295 					code);
296 	}
297 
298 	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
299 		struct v4l2_subdev_frame_size_enum *fse = arg;
300 
301 		if (fse->pad >= sd->entity.num_pads)
302 			return -EINVAL;
303 
304 		return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
305 					fse);
306 	}
307 
308 	case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
309 		return v4l2_subdev_call(sd, video, g_frame_interval, arg);
310 
311 	case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
312 		return v4l2_subdev_call(sd, video, s_frame_interval, arg);
313 
314 	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
315 		struct v4l2_subdev_frame_interval_enum *fie = arg;
316 
317 		if (fie->pad >= sd->entity.num_pads)
318 			return -EINVAL;
319 
320 		return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
321 					fie);
322 	}
323 
324 	case VIDIOC_SUBDEV_G_SELECTION: {
325 		struct v4l2_subdev_selection *sel = arg;
326 
327 		if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
328 		    sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
329 			return -EINVAL;
330 
331 		if (sel->pad >= sd->entity.num_pads)
332 			return -EINVAL;
333 
334 		return v4l2_subdev_call(
335 			sd, pad, get_selection, subdev_fh, sel);
336 	}
337 
338 	case VIDIOC_SUBDEV_S_SELECTION: {
339 		struct v4l2_subdev_selection *sel = arg;
340 
341 		if (sel->which != V4L2_SUBDEV_FORMAT_TRY &&
342 		    sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
343 			return -EINVAL;
344 
345 		if (sel->pad >= sd->entity.num_pads)
346 			return -EINVAL;
347 
348 		return v4l2_subdev_call(
349 			sd, pad, set_selection, subdev_fh, sel);
350 	}
351 
352 	case VIDIOC_SUBDEV_G_EDID:
353 		return v4l2_subdev_call(sd, pad, get_edid, arg);
354 
355 	case VIDIOC_SUBDEV_S_EDID:
356 		return v4l2_subdev_call(sd, pad, set_edid, arg);
357 #endif
358 	default:
359 		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
360 	}
361 
362 	return 0;
363 }
364 
365 static long subdev_ioctl(struct file *file, unsigned int cmd,
366 	unsigned long arg)
367 {
368 	return video_usercopy(file, cmd, arg, subdev_do_ioctl);
369 }
370 
371 static unsigned int subdev_poll(struct file *file, poll_table *wait)
372 {
373 	struct video_device *vdev = video_devdata(file);
374 	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
375 	struct v4l2_fh *fh = file->private_data;
376 
377 	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
378 		return POLLERR;
379 
380 	poll_wait(file, &fh->wait, wait);
381 
382 	if (v4l2_event_pending(fh))
383 		return POLLPRI;
384 
385 	return 0;
386 }
387 
388 const struct v4l2_file_operations v4l2_subdev_fops = {
389 	.owner = THIS_MODULE,
390 	.open = subdev_open,
391 	.unlocked_ioctl = subdev_ioctl,
392 	.release = subdev_close,
393 	.poll = subdev_poll,
394 };
395 
396 #ifdef CONFIG_MEDIA_CONTROLLER
397 int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
398 				      struct media_link *link,
399 				      struct v4l2_subdev_format *source_fmt,
400 				      struct v4l2_subdev_format *sink_fmt)
401 {
402 	if (source_fmt->format.width != sink_fmt->format.width
403 	    || source_fmt->format.height != sink_fmt->format.height
404 	    || source_fmt->format.code != sink_fmt->format.code)
405 		return -EINVAL;
406 
407 	return 0;
408 }
409 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
410 
411 static int
412 v4l2_subdev_link_validate_get_format(struct media_pad *pad,
413 				     struct v4l2_subdev_format *fmt)
414 {
415 	if (media_entity_type(pad->entity) == MEDIA_ENT_T_V4L2_SUBDEV) {
416 		struct v4l2_subdev *sd =
417 			media_entity_to_v4l2_subdev(pad->entity);
418 
419 		fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
420 		fmt->pad = pad->index;
421 		return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
422 	}
423 
424 	WARN(pad->entity->type != MEDIA_ENT_T_DEVNODE_V4L,
425 	     "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
426 	     pad->entity->type, pad->entity->name);
427 
428 	return -EINVAL;
429 }
430 
431 int v4l2_subdev_link_validate(struct media_link *link)
432 {
433 	struct v4l2_subdev *sink;
434 	struct v4l2_subdev_format sink_fmt, source_fmt;
435 	int rval;
436 
437 	rval = v4l2_subdev_link_validate_get_format(
438 		link->source, &source_fmt);
439 	if (rval < 0)
440 		return 0;
441 
442 	rval = v4l2_subdev_link_validate_get_format(
443 		link->sink, &sink_fmt);
444 	if (rval < 0)
445 		return 0;
446 
447 	sink = media_entity_to_v4l2_subdev(link->sink->entity);
448 
449 	rval = v4l2_subdev_call(sink, pad, link_validate, link,
450 				&source_fmt, &sink_fmt);
451 	if (rval != -ENOIOCTLCMD)
452 		return rval;
453 
454 	return v4l2_subdev_link_validate_default(
455 		sink, link, &source_fmt, &sink_fmt);
456 }
457 EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
458 #endif /* CONFIG_MEDIA_CONTROLLER */
459 
460 void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
461 {
462 	INIT_LIST_HEAD(&sd->list);
463 	BUG_ON(!ops);
464 	sd->ops = ops;
465 	sd->v4l2_dev = NULL;
466 	sd->flags = 0;
467 	sd->name[0] = '\0';
468 	sd->grp_id = 0;
469 	sd->dev_priv = NULL;
470 	sd->host_priv = NULL;
471 #if defined(CONFIG_MEDIA_CONTROLLER)
472 	sd->entity.name = sd->name;
473 	sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
474 #endif
475 }
476 EXPORT_SYMBOL(v4l2_subdev_init);
477